| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 3 | 
                                                                 
                                    
                                    1.3%
                                 
                                                             | 
                                                        
                    
| 2 | 7 | 
                                                                 
                                    
                                    3.1%
                                 
                                                             | 
                                                        
                    |
| 3 | 6 | 
                                                                 
                                    
                                    2.7%
                                 
                                                             | 
                                                        
                    |
| 4 | 10 | 
                                                                 
                                    
                                    4.4%
                                 
                                                             | 
                                                        
                    |
| 5 | 14 | 
                                                                 
                                    
                                    6.2%
                                 
                                                             | 
                                                        
                    |
| 6 | 17 | 
                                                                 
                                    
                                    7.5%
                                 
                                                             | 
                                                        
                    |
| 7 | 24 | 
                                                                 
                                    
                                    10.6%
                                 
                                                             | 
                                                        
                    |
| 8 | 39 | 
                                                                 
                                    
                                    17.3%
                                 
                                                             | 
                                                        
                    |
| 9 | 13 | 
                                                                 
                                    
                                    5.8%
                                 
                                                             | 
                                                        
                    |
| 10 | Very effective | 16 | 
                                                                 
                                    
                                    7.1%
                                 
                                                             | 
                                                        
                    
| 11 | Don't know | 77 | 
                                                                 
                                    
                                    34.1%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 11 |